Hilary, thanks so much for responding so quickly! I've modified the mapping...see below. Please confirm that it looks correct. Yes, I did drag the Error node onto my form and the GenerateGuid command worked. With the modified mapping, I am now no longer even getting prompted to login to the SharePoint...

I have a form with 11 fields in a repeating table. There are also 6 "header" fields that apply to each of the rows in the repeating table. This form is client based, created in InfoPath 2010, but saved to work with InfoPath 2007. The intention is that field personnel use it to do inventory...